Calculating Current, Resistance and Voltage Across Circuits

The current in the wires of a circuit is 120.0 milliAmps. If the battery was replaced by one with double the voltage (with no other replacements), then its new current would be _____ milliAmps.

• 60 milliAmps

• 120 milliAmps

• 240 milliAmps

• No way to tell

The resistance of a light bulb is 30 ohms. If the current must double but the battery is remaining the same, the light bulb must be replaced by one with ____ ohms.

• 60 ohms

• 30 ohms (the light bulb resistance will not change)

• 15 ohms

• More information is needed

The resistance of the light bulb is 15 ohms. If the battery was replaced by one with double the voltage (with no other replacements), then the light bulb resistance must _____.

• Increase to 30 ohms

• Not change

• Decrease to 7.5 ohms

• No way to tell

The current in the wires of a circuit is 60.0 milliAmps. If the battery was replaced by one with ⅓ of the original voltage (with no other replacements), then its new current would be _____ milliAmps.

• 20 milliamps

• 60 milliamps

• 180 milliamps

• No way to tell

The voltage of the battery is 8 volts. If the current must double but the light bulb is remaining the same, the battery must be replaced by one with ____ volts

• 16 volts

• 8 volts (the battery voltage won’t change)

• 4 volts

• More information is needed

The current in the wires of a circuit is 180.0 milliAmps. If the light bulb was replaced by one with one half of the original resistance (with no other replacements), then its new current would be _____ milliAmps.

• 90 milliAmps

• 180 milliAmps

• 360 milliAmps

• No way to tell

The current in the wires of a circuit is 90.0 milliAmps. If the light bulb was replaced by one with triple the original resistance (with no other replacements), then its new current would be _____ milliAmps.

• 30 milliAmps

• 90 milliAmps

• 270 milliAmps

• No way to tell

The voltage of a battery is 9 V. If the light bulb was replaced by one with triple the original resistance (with no other replacements), then the battery voltage must _____.

• Increase to 27 volts

• Not change

• Decrease to 3 volts

• No way to tell

The current in the wires of a circuit is 90.0 milliAmps. If the light bulb was replaced by one with double the original resistance and the battery is replaced by one with triple the original voltage, then its new current would be _____ milliAmps.

• 15 milliAmps

• 60 milliAmps

• 135 milliAmps

• 540 milliamps

The current in the wires of a circuit is 72.0 milliAmps. If the light bulb was replaced by one with one half the original resistance and the battery is replaced by one with triple the original voltage, then its new current would be _____ milliAmps.

• 12 milliAmps

• 48 milliAmps

• 108 milliAmps

• 432 milliAmps